Here's a video explaining the principal. They haven't achieved more outpit than input yet, but fusion creates giant magnetic fields that can in theory generate electricity. It's really fascinating
But it takes wiggling magnetic fields to confine fusion reactions, seems like taking energy from inefficient containment, or there's more energy than required being used on containment which is lowering the overall efficiency....
There are other more efficient working fluids for power transfer but water is pretty hard to beat due to it not being toxic or an environmental hazard.
I'll believe it when they actually generate net electricity output. I don't necessarily think they're a scam per se, but given the relative resources available and difficulty even for international projects to get fusion power working, I don't suspect their efforts will be successful. Would love to be proven wrong of course, or if not for their work to at least contribute useful progress to the effort.
I mean they’re using an effectively off the shelf reactor which if outputted as promised would fatally irradiate anyone in the area, so i’m not sure the’re really set up to do much beyond separation of fools and money.
Remember that time when a physicist proposed a Thorium Potassium reactor which woudl run at a lower temperature and the feature that the reaction would destroy itself before ever going critical and the world was like "interesting" and then he said "and it even prevents weaponised uranium" and then the world went "no thank you"
Pretty much everything that's not totally inert produces heat, but the point (they claim!) is that these newfangled doodads don't generate power using that heat.
So far we've mainly been generating power with more and more ingenious ways of heating up water.